The given graph depicts the production levels of the main kinds of fuel in the UK between 1981 and 2000.
There are three types of energy use during the period, such as petroleum, coal, and natural gas.
In early 1981, petroleum production energy units were at a peak level. While the percentage of coal and natural gas was 80% and 40%, respectively. In the year 1986, the petroleum unit increased, and production energy units were 140%. On the other side, coal energy production declined, and it traded at 60%, and natural gas was steady during this period.
In the year 1991, coal and natural gas energy unit production were the same, at approximately 50%; then, natural gas energy unit production increased, and coal energy production consolidated then decreased. While during this period petroleum energy unit production decreased and traded at 100%, then petroleum prices increased. In the last year, petroleum production was highest, then natural gas was second highest, and coal was last.
In summary, petroleum production was around 90% in the year 1981; then, in the year 2000, petroleum was at 140%. While coal production was 80%, and natural gas production was approximately 40%. Natural gas production around 100% and coal production was nearby 30%.